Shanghai Daoqin Plastics Co., Ltd.

         according to foaming gas 体 源, can will foaming agent main/primary separation formed below/following type: 即 material foaming agent and chemical foaming agent . from upper can 知, material foaming agent generate gas is through material 理变化—— generally is from liquid to gas 态;而 chemical foaming agent generate gas is through chemical reaction. rear is hot property chemical product, add hot 时, foaming agent separation understanding reaction, generate gas and solid types separation understanding material, upper type foaming agent also can separation formed many small type. material foaming agent from upper 讲, in processing process in, can and polymer mixed combined, 并随之 can 汽化 材 material, can use as is foaming agent. 但实际 upper, material foaming agent most good is in conditions can liquid 化, in positive plastics processing temperature degree (or low this temperature degree) lower, can 够汽化, make plastics foaming. this category of foaming agent must in conditions lower can solvent polymer, solvent understanding degree can large. foaming agent gas in polymer inner can force non important, mono weight foaming agent 释放 出 gas 体 体积也同样 important. rear 者即称 as foaming agent efficiency, for/regarding has various type type foaming agent 说, this is types important testing indicators, high foaming agent standards is: 每克至 less 释放150-200cc. gas 体(按 standards 状态计).

         currently most commonly used material foaming agent is chlorine fluorine type, type and pressure shrink gas 体(如 nitrogen gas and CO2). this category of foaming agent use requirements is: its temperature degree and pressure must ensure foaming agent liquid 态形式 and plastics mixed combined. 当改变 temperature degree and / or pressure can make foaming agent 发生汽化, 即开始 foaming. 例如, if types low 沸点 烃 type foaming agent by 泵送至一台装 has melt plastics machine in, that 么挤塑 machine inner high pressure can make type foaming agent maintain liquid 态形式 solvent polymer in, polymer melt 出挤塑 machine 时, pressure drop make foaming agent 汽化, from generate foam. simple gas 体, nitrogen gas and CO2则 need ratio type or chlorine fluorine type high more pressure, can to this 一结果. agent can promote formed uniform structure.

         is made formed low density foam plastics (density low 至 10lb/cu.ft. left right) using/adopting chlorine fluorine and type foaming agent 效果极佳. its main/primary causes has 两. is due to foaming agent amount large (has to resin weight 20% or more more), this category of foaming agent need ratio chemical foaming agent 便宜, this 就补偿 equipment upper relatively high use;二 is and foam stability hot force related. positive 如本文 front to, need make foam stability 化, must in 出现塌陷之 front 就 改变 polymer melt viscosity. use most 广泛 烃 type and chlorine fluorine type foaming agent, upper can reduce it used for polymer melt viscosity. it 们发生汽化而脱离 polymer solvent liquid 时, melt viscosity rise high, can decrease/reduce is stability foam cooling use. for/regarding low density foam plastics 说, this especially important.

        尽 tube/pipe foaming agent tool has solid has advantages, use 起 并不 is has issues. large separation this category of foaming agent 都会污染自然 ring 境, but also positive in 继续严 heavy 化. especially is chlorine fluorine type. type has this issues, is degree light.

         use most 广泛 chlorine fluorine type foaming agent , is full product types, usually as CFCS. CFC-11 and CFC-12就 is type table/sheet. in recent years, already 经确认, this category of chemical product use and large gas upper oxygen thin has 关. therefore, through method 律约束 and action combined, this category of foaming agent positive speed by 淘汰, currently it positive in by separation chlorine fluorine type (HCFCS) and fluorine type (HFCS) use. is product most rear is can use, this issues currently also can 肯定. its it and upper different 取代途径 currently positive in discussion in. DOW company most 近宣称, development types using/adopting CO2 manufacturing low density polystyrene (PS) foam plastics new process.

         another type commonly used material foaming agent, 即烃 type , versus for for oxygen has what effect/influence. however it use is has regulations made. type 释放也 and its it property has machine combined material (VOCS)一样, need to method 律 限 made, is it 们 释放 material 会危害 low large gas 层, especially is formed oxygen. regulations property in 各 区 is has difference, this need according to 当 空 gas quality 而定. in addition also 应考虑 to easy property. in as using/adopting type is foaming agent factory design 时, this 一点应 is important factors. most used as foaming agent type is and positive 戊烷.

         chemical foaming agent chemical foaming agent can separation formed main/primary type type: has machine chemical product and machine chemical product. has machine chemical foaming agent product types non more, machine chemical foaming agent types type has 限. most chemical foaming agent (large in 1850 year) is simple machine carbon acid salt and carbon acid hydrogen salt. this category of chemical product add hot rear 会放出CO2, it most rear by carbon acid hydrogen salt and acid mixed material 取代, is rear 者 预 rear need good more. more excellent 秀 无 machine foaming agent, its chemical mechanism basic and upper same, is poly carbon acid type (原文 is Poly-carbonic acids) and carbon acid salt type mixed use. poly carbon acid separation understanding is hot reaction, in 320°F left right, acid can 放出100cc. left right CO2, 进一步 add hot 至390°F left right 时, will 会放出 more more gas 体. this separation understanding reaction hot property can can belt/tape certain types degree benefits, is in foaming process in dispersion remove hot amount is large issues. remove as is foaming gas 体 源, this category of material 质时常 also used as material foaming agent agent. 据信, this category of chemical foaming agent separation understanding formed most 初 泡孔, is rear material foaming agent gas provide 迁移 场.

         and machine foaming agent versus 反, can selection has machine chemical foaming agent product types more, material 理形态也各自 different. year evaluation types can can used as foaming agent has machine chemical product. use 评判 准则也 very more. most important strip/profile is: in can control speed degree and can expected temperature degree conditions lower, gas not only amount large, but also again property good; reaction generate gas and solid is 无毒者, but also for/regarding foaming polymer can has defect effect/influence, 例如, generate color or defect odor; most rear, is cost issues, this is versus important strip/profile 准则. industrial upper use that foaming agent, is most combined upper this 准则.

         low temperature foaming agent from more can selection chemical foaming agent in selection, main/primary 应考虑 issues is: foaming agent separation understanding temperature degree and plastics processing temperature degree versus 适应. has types has machine chemical foaming agent already is low temperature polyvinyl chloride (PVC), low density polyethylene (PE) and certain ring oxygen 广泛接受. types is 甲苯磺酰肼(TSH). this is types color powder 末, separation understanding temperature degree is 240°F left right. 每克约 generate 115cc nitrogen gas and water separation. types is oxidation di (苯磺酷)肋, or 称OBSH. this type of foaming agent or in low temperature applications in use more is 普遍, this type of material is white fine powder 状, its positive separation understanding temperature degree is 320°F. if using/adopting active agent, 如尿素 or alcohol amine, can will this temperature degree decline to 265°F left right. can 放出125cc gas 体, main/primary is nitrogen gas. OBSH separation understanding rear solid material is polymer, if it and TSH共同 use, can decrease light 臭味.

         high temperature foaming agent for/regarding high temperature plastics 说, heat resistant ABS, hard polyvinyl chloride (PVC) type, low melt flow index polypropylene (PP) type and engineering plastics, polycarbonate (PC) and nylon, using/adopting relatively high separation understanding temperature degree foaming agent comparison combined 适. 甲苯磺酞氨基崛(TSS or TSSC) is types very fine white powder 末, separation understanding temperature degree 约445°F, 一克发 gas amount is 140cc, main/primary is nitrogen gas and CO2 mixed combined material, has a small amount of CO and 氨. this type of foaming agent used for polypropylene (PP) and certain ABS. due to its separation understanding temperature degree 之故, therefore it in polycarbonate (PC) application is has 限. another types high temperature foaming agent ——5一本基四唑(5-PT)一直 formed use in polycarbonate (PC) in. it in 约425°F开始缓 slow separation understanding, gas amount large.直 to temperature degree to 465一480°F, a large amount of gas, this temperature degree scope/range very polycarbonate (PC) processing process. gas amount large is 175cc/g, main/primary is nitrogen gas. another also has positive in development in 四唑衍生 material, it tool has relatively high separation understanding temperature degree, but also gas ratio 5—PT also more.

        偶 nitrogen carbon acid amine large more main/primary industrial use thermoplastic property plastics processing temperature degree, its scope/range upper 述. large separation polyolefin type, polyvinyl chloride (PVC) type and styrene type thermoplastic property plastics processing temperature degree scope/range in 300-410°F. for/regarding this category of plastics, has types foaming agent use can 靠, is nitrogen carbon acid amine, also nitrogen di acid amine, or 简称AZO or AZ. in pure 净状态时, it is types color /橙 color powder 末, large in 390°F separation understanding, separation understanding gas amount is 220cc/g, gas main/primary is nitrogen gas and CO, belt/tape has a small amount of CO2, in certain conditions lower has 氨. its solid separation understanding material is color, it not only can as is table/sheet full separation understanding agent, but also for foaming plastics color defect effect/influence.